Inducing premature atrial contractions for the purpose of monitoring autonomic tone risk of sudden cardiac death and ischemic events
First Claim
1. For use with an implantable system, a method of performing at least one of a cardiac assessment and an autonomic assessment, comprising:
- (a) inducing premature atrial contractions (PACs) to thereby cause a corresponding premature contractions in the ventricles;
(b) monitoring morphology of a signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs;
(c) performing at least one of a cardiac assessment and an autonomic assessment, based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs, wherein performing the assessment comprises identifying a period as a myocardial ischemic event based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; and
(d) triggering one or more responses based on the assessment.
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Accused Products
Abstract
Implantable systems, and methods for use therein, perform at least one of a cardiac assessment and an autonomic assessment. Premature atrial contractions (PACs) are induced to thereby cause corresponding premature contractions in the ventricles. Short-term fluctuations in cardiac intervals, that follow the premature contractions in the ventricles caused by the induced PACs, are monitored. At least one of a cardiac assessment and an autonomic assessment is performed based on the monitored fluctuations in cardiac intervals that follow the premature contractions in the ventricles caused by the induced PACs. This can include assessing a patient'"'"'s risk of sudden cardiac death (SCD), assessing a patient'"'"'s autonomic tone and/or detecting myocardial ischemic events based on the monitored fluctuations in cardiac intervals that follow the premature contractions in the ventricles caused by the induced PACs.
22 Citations
25 Claims
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1. For use with an implantable system, a method of performing at least one of a cardiac assessment and an autonomic assessment, comprising:
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(a) inducing premature atrial contractions (PACs) to thereby cause a corresponding premature contractions in the ventricles; (b) monitoring morphology of a signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; (c) performing at least one of a cardiac assessment and an autonomic assessment, based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs, wherein performing the assessment comprises identifying a period as a myocardial ischemic event based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; and (d) triggering one or more responses based on the assessment. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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8. An implantable system for performing at least one of a cardiac assessment and an autonomic assessment, comprising:
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means for inducing premature atrial contractions (PACs) to thereby cause corresponding premature contractions in the ventricles; means for monitoring morphology of a signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; and means for performing at least one of a cardiac assessment and an autonomic assessment, based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs, wherein the means for performing identifies a myocardial ischemic event based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs. - View Dependent Claims (9, 10, 11)
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12. An implantable system for performing at least one of a cardiac assessment and an autonomic assessment, comprising:
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a pulse generator programmed to induce premature atrial contractions (PACs) to thereby cause corresponding premature contractions in the ventricles; a morphology detector programmed to monitor morphology of a signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; and a microprocessor programmed to perform at least one of a cardiac assessment and an autonomic assessment, based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs, wherein the microprocessor is programmed to compare the monitored morphology to a baseline morphology, and identify a myocardial ischemic event when the monitored morphology differs from the baseline morphology by more than a first specified degree. - View Dependent Claims (13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. For use with an implantable system, a method of performing at least one of a cardiac assessment and an autonomic assessment, comprising:
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(a) inducing a premature atrial contraction (PAC) that is followed, after an AV delay, by delivery of a ventricular pacing pulse; (b) monitoring short-term fluctuations in cardiac intervals that follow the delivery of the ventricular pacing pulse that followed the induced PAC; (c) performing at least one of a cardiac assessment and an autonomic assessment, based on the monitored fluctuations in cardiac intervals that follow the delivery of the ventricular pacing pulse that followed the induced PAC, wherein performing the assessment comprises identifying a myocardial ischemic event based on the monitored morphology of the signal that is indicative of cardiac intervals that follow the premature contractions of the ventricles caused by the induced PACs; and (d) triggering one or more responses based on the assessment. - View Dependent Claims (23, 24, 25)
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Specification